Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/blame/commit/47ed2822ebb74d8c63f56b117e6d1b97ff2ec5d4/mqtt/mqtt_cmd.h
You should set ROOT_URL correctly, otherwise the web may not work correctly.